DSXchange

I'm testing sending email via a job.
On UNIX, the sendmail file is in the /usr/lib directory and DS is looking for this file in /usr/sbin.
we created a link and it works ok but in production, we are not allow at this point to create links ...
That's why we need to know if we can change something in DS to make it search the /usr/lib/sendmail file instead of the /usr/sbin/sendmail
Is it possible to make this chabge ? if yes, where can we change it ?
Thanks a lot for your answers.

An other question dealing with Email Notification Activity :
I have added a new parameter to my Job Sequencer for recipient email address.
When filling in the email Notification Activity, how can I use this parameter ?
How can I specifie that the recipient email address field contains my parametername ?
Thanks.